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26 INFRASTRUCTURE AUSTRALIA APRIL 2011
Water
Dam upgrades to increase flood capacity
Several dams operated by State
Water in regional NSW are being
upgraded to meet ood capacity
guidelines set by the NSW Dams
Safety Committee and the Australian Na-
tional Committee on Large Dams.
e crest raising component of the rst
stage of the upgrade of the Burrendong
Dam on the Macquarie River is on track
for completion in April, a year a er con-
struction commenced.
The $28 million upgrade involves
raising the height of the dam wall and
two saddle dams by 1.8m and modifying
the spillway to enable the structure to
withstand extreme oods. State Water is
overseeing the project being carried out
by Macmahon Contractors. The NSW
Department of Commerce carried out the
detailed design works. Parsons Brincker-
ho is engaged to provide construction
site management services.
Once crest raising works are complete
spillway modi cation work will be carried
out. e spillway modi cation is being
designed by URS Australia.
Funding has been fast-tracked for the
second stage of the upgrade of Cha ey
Dam near Tamworth. e $13 million
rst stage was completed last month. e
project designed by URS and built by John
Holland involved building a 35m wide
auxiliary spillway and 4.5m high release
plug. Construction of the second stage will
commence in 2012 and take about two
years. As part of the upgrade, a parapet
will be built to raise the height of the dam
wall by 8m.
e upgrade of the nearby Keepit Dam
is scheduled for completion in 2013.
Works include raising the main dam wall,
as well as building three saddle dams, an
abutment fuse plug spillway and a subwall
fuse plug spillway. John Holland is the
construction contractor supervised by
NSW Public Works.
Keepit Dam operates in conjunction
with Split Rock Dam, where a new para-
pet wall is planned to be built by 2012.
Construction is scheduled to commence
later this year.
e $33 million rst stage upgrade of
Blowering Dam near Tumut was completed
in December. It consisted of building a par-
apet on the crest of the dam and raising the
spillway chute wall. e project was carried
out by Macmahon under the supervision of
Professional Engineering Services. SMEC
completed the detailed design.
Construction of the rst stage of the
Copeton Dam upgrade near Inverell is
scheduled to begin later this year. e
project, which involves the construction
of an auxiliary fuse plug spillway, was
designed by URS.
e $60 million upgrade of the Hume
Dam near Albury-Wodonga is planned to
be complete in 2015. Advanced Foundation
Solutions is carrying out the lter drain-
age works with SMEC doing construction
management. URS is designing the south-
ern training wall strengthening works.
The upgrade of the Wyangala Dam
near Cowra involves raising the spillway
chute wall, installing a gate raising and
locking system, and raising the dam wall
crest. Contract for the detailed design of
the gate system was awarded to NSW Pub-
lic Works. e gate locking mechanism
developed by MWH uses brake calipers
to lock the gate into the new fully raised
position.
The new auxillary spillway at
Chaffey Dam is complete.
A saddle dam of the Burrendong Dam is being raised as part of a project to comply with flood
safety guidelines.